Thought this might be interesting - anything interesting you can add I'll include in the list and update after a while.. 1/23 a bit of adding in done. If you post, try and do it in the same form as below so I can cut and paste.
213g - Argapa Piccolo [historic 'Midget' size] with graphtech tuners
225g - Kumalae Style A - 1940s wooden pegs
323g - 1918 Weymann weighed it at 8.2 oz
235g - 1920s Koa Hawaiian
240g - 1920s Regal, cuban mahogany
245g - Tom Pocket (travel sopranino)
253g - 1920s Regal-made SS Stewart, cuban mahogany
260g - Kiwaya KTS-4 mahogany (I've found this elsewhere listed at 290g - can anyone check?)
260g - Martin-20's Style O-Mahogany
261g - Rob Collins meranti soprano with wooden pegs
275g - Argapa soprano with wooden pegs
275g - Japanese 1970s plywood/cheap plastic friction tuners (slightly short scale length)
277g - Lyra Island Style
279g -Favilla U-2, mahogany, 1930s-'40s. After two weeks of humidifying at 46 to 51 percent, 281g on same digital postal/kitchen scale.
280g - Kala Travel mk.II with friction tuners
283g - Martin-50's Style O-Mahogany
284g - Ken Timms "Island" style (wooden pegs)
285g - Martin early-1930s Mahogany
285g - Roy Smeck mahogany; plastic fretboard
289g - Early 40's Martin Style 0 with Pegheds (10.37 oz)
291g - Kiwaya KTS-4 2012 model
292g - La Foley 1920s Soprano (13" scale length)
293g - Timms 2014 Honduran Mahogany/Pegheds
294g - Pete Howlett Helsinki
298g - John Colter home built 'Cuban' mahogany
297g - Martin 1920s Style 0
297g - Style 3 Martin with heavy Grover champion tuners (w/originals nearer 277g?)
299g - Kala KA-SEM
302g - Martin 60s Style 0
303g - late 1930s sunburst Gibson uke-1
304g - Martin Konter Replica with Pegheds
304g - Kepasa Madeira
304g - Kiwaya KTS-7
306g - Ohana SK28 Hawaiian style, recessed fingerboard, mahogany
306g - vintage Martin Style 0
308g - Gibson Style 2
309g - Kamaka Gold Label/Waverleys
312g - Loprinzi cedar/mahogany (11 oz)
312g - G-String matte koa
312g - Favilla mahogany
315g - Ohana SK38
316g - 1948 Gibson uke-2
317g - Teens/20's Favilla 12 fret mahogany soprano (11.18 oz)
320g - Howlett Mahogany
321g - Timms mahogany (11.25 oz)
323g - 1970s no-name made in japan plywood ukulele
327g - plastic 50s Islander
331g - Kiwaya KS-1 (Eco laminate) with friction tuners
333g - early 1930s Gibson uke-1
335g - 2007 Mahalo 'Custom' U/LTD2 mahogany top with its original friction tuners
340g - Kala Travel Soprano (geared tuners?)
340g - Mituba Gakki basic soprano 1960s
340g - Imua koa (12 oz)
340g - VanPelt redwood/walnut (12 oz)
341g - 2014 Timms Honduran Mahogany with friction tuners
346g - Famous FS-1, 12-fret design, with stock Gotoh friction tuners (12.2 oz)
348g - Ohana SK35 (no gloss)
354g - Ken Timms 2009 Fireplace Special ( style 0 copy)
355g - Stuart Longridge (solid yew body, walnut neck)
355g - Millar PD-210MN Phil Doleman signature soprano ukulele. Solid mahogany. UPT tuners.
358g - Bruko ( solid mahogany type body, maple neck)
359g - Kiwaya KSU-1
360g - Ohana SK35G
361g - Ken Timms 2008 style 0
365g - Kiwaya FS-5 DX Eco with UPTH planetary tuners (the Koa laminate)
369g - Kiwaya FS-5G with geared tuners (and two tiny strap buttons)
374g - Martin 2014 Cherry 3 (13.2oz)
376g - Black bear koa (13.25 oz)
283g - KoAloha
397g - Kamaka (w/strap button) (14 oz)
397g - Wm King cedar/koa (w/oversize tuners) (14 oz)
406g - KoAloha Pineapple
408g - Kala (solid acacia body, mahogany type neck)
408g - Risa Uke Solid
410g - Koaloha KSO-10 (with UPTs and one strap button)
417g - Martin OXK
419g - AnueNue Re-entrants Signature
425g - Kala Acacia
425g - Kala KA-KIWI
429g - Flea
430g - Simon Bush Native soprano
430g - Tangi gloss mahogany soprano yr. 2000
450g - Makala Dolphin
475g - Makala Dolphin
495g - Applause UA-10
554g - Applause UAE-20
600g - Ken Smith Uukleles mahogany top/ serpentwood sides/back/fretboard
213g - Argapa Piccolo [historic 'Midget' size] with graphtech tuners
225g - Kumalae Style A - 1940s wooden pegs
323g - 1918 Weymann weighed it at 8.2 oz
235g - 1920s Koa Hawaiian
240g - 1920s Regal, cuban mahogany
245g - Tom Pocket (travel sopranino)
253g - 1920s Regal-made SS Stewart, cuban mahogany
260g - Kiwaya KTS-4 mahogany (I've found this elsewhere listed at 290g - can anyone check?)
260g - Martin-20's Style O-Mahogany
261g - Rob Collins meranti soprano with wooden pegs
275g - Argapa soprano with wooden pegs
275g - Japanese 1970s plywood/cheap plastic friction tuners (slightly short scale length)
277g - Lyra Island Style
279g -Favilla U-2, mahogany, 1930s-'40s. After two weeks of humidifying at 46 to 51 percent, 281g on same digital postal/kitchen scale.
280g - Kala Travel mk.II with friction tuners
283g - Martin-50's Style O-Mahogany
284g - Ken Timms "Island" style (wooden pegs)
285g - Martin early-1930s Mahogany
285g - Roy Smeck mahogany; plastic fretboard
289g - Early 40's Martin Style 0 with Pegheds (10.37 oz)
291g - Kiwaya KTS-4 2012 model
292g - La Foley 1920s Soprano (13" scale length)
293g - Timms 2014 Honduran Mahogany/Pegheds
294g - Pete Howlett Helsinki
298g - John Colter home built 'Cuban' mahogany
297g - Martin 1920s Style 0
297g - Style 3 Martin with heavy Grover champion tuners (w/originals nearer 277g?)
299g - Kala KA-SEM
302g - Martin 60s Style 0
303g - late 1930s sunburst Gibson uke-1
304g - Martin Konter Replica with Pegheds
304g - Kepasa Madeira
304g - Kiwaya KTS-7
306g - Ohana SK28 Hawaiian style, recessed fingerboard, mahogany
306g - vintage Martin Style 0
308g - Gibson Style 2
309g - Kamaka Gold Label/Waverleys
312g - Loprinzi cedar/mahogany (11 oz)
312g - G-String matte koa
312g - Favilla mahogany
315g - Ohana SK38
316g - 1948 Gibson uke-2
317g - Teens/20's Favilla 12 fret mahogany soprano (11.18 oz)
320g - Howlett Mahogany
321g - Timms mahogany (11.25 oz)
323g - 1970s no-name made in japan plywood ukulele
327g - plastic 50s Islander
331g - Kiwaya KS-1 (Eco laminate) with friction tuners
333g - early 1930s Gibson uke-1
335g - 2007 Mahalo 'Custom' U/LTD2 mahogany top with its original friction tuners
340g - Kala Travel Soprano (geared tuners?)
340g - Mituba Gakki basic soprano 1960s
340g - Imua koa (12 oz)
340g - VanPelt redwood/walnut (12 oz)
341g - 2014 Timms Honduran Mahogany with friction tuners
346g - Famous FS-1, 12-fret design, with stock Gotoh friction tuners (12.2 oz)
348g - Ohana SK35 (no gloss)
354g - Ken Timms 2009 Fireplace Special ( style 0 copy)
355g - Stuart Longridge (solid yew body, walnut neck)
355g - Millar PD-210MN Phil Doleman signature soprano ukulele. Solid mahogany. UPT tuners.
358g - Bruko ( solid mahogany type body, maple neck)
359g - Kiwaya KSU-1
360g - Ohana SK35G
361g - Ken Timms 2008 style 0
365g - Kiwaya FS-5 DX Eco with UPTH planetary tuners (the Koa laminate)
369g - Kiwaya FS-5G with geared tuners (and two tiny strap buttons)
374g - Martin 2014 Cherry 3 (13.2oz)
376g - Black bear koa (13.25 oz)
283g - KoAloha
397g - Kamaka (w/strap button) (14 oz)
397g - Wm King cedar/koa (w/oversize tuners) (14 oz)
406g - KoAloha Pineapple
408g - Kala (solid acacia body, mahogany type neck)
408g - Risa Uke Solid
410g - Koaloha KSO-10 (with UPTs and one strap button)
417g - Martin OXK
419g - AnueNue Re-entrants Signature
425g - Kala Acacia
425g - Kala KA-KIWI
429g - Flea
430g - Simon Bush Native soprano
430g - Tangi gloss mahogany soprano yr. 2000
450g - Makala Dolphin
475g - Makala Dolphin
495g - Applause UA-10
554g - Applause UAE-20
600g - Ken Smith Uukleles mahogany top/ serpentwood sides/back/fretboard
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