I made this thread to dispel sizing misinformation regarding the Alpinist 2020.
SARB Series Alpinist: SARB013 - SARB015 - SARB017 - SPB089 case width 8pm to 2pm (to avoid the crowns) is 39.5mm (see pic)
Prospex Series Alpinist 2020: SPB121J - SPB117J - SPB119J - SPB123J stated case size is 39.5mm
Shock horror! It's because they are the exact same case (discounting the case back) and nothing has changed, you can change bracelets between them because the cases are the same! There has not been a shift from 38mm to 39.5mm, the old alpinist was always 39.5mm it's just many "experts" on youtube can't afford a pair of Chinese digital calipers and therefore confuse the hell out of everyone. The only different dimension is height, which has gone from 12.2mm to around 13.2-13.5mm (I don't own a new one) to accommodate the exhibition case back.
*Mods please move to Seiko forum if required*
SARB Series Alpinist: SARB013 - SARB015 - SARB017 - SPB089 case width 8pm to 2pm (to avoid the crowns) is 39.5mm (see pic)

Prospex Series Alpinist 2020: SPB121J - SPB117J - SPB119J - SPB123J stated case size is 39.5mm
Shock horror! It's because they are the exact same case (discounting the case back) and nothing has changed, you can change bracelets between them because the cases are the same! There has not been a shift from 38mm to 39.5mm, the old alpinist was always 39.5mm it's just many "experts" on youtube can't afford a pair of Chinese digital calipers and therefore confuse the hell out of everyone. The only different dimension is height, which has gone from 12.2mm to around 13.2-13.5mm (I don't own a new one) to accommodate the exhibition case back.
*Mods please move to Seiko forum if required*