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Morning guys (at least in South East Asia!) Digging thru my collection to find something to wear this Friday I pulled out this. A 'Croton Nivada Grenchen Aquamatic'.. now that's a mouthful, as the actress told the bishop. Inside we find a nicely finished ETA1256 movement. This would be one of the first ETA automatics. ETA kindly provided instructions on the rotor (hammer)... "TO REMOVE HAMMER ASSEMBLY UNSCREW 3 SCREWS 'A' ". Probably they were worried that watchmaker of the day would have problems with these newfangled technology!. Croton were one of the early innovators of waterproofing and they achieved this on early models with a case back that was fastened by 4 screws. These might have worked back in the day but they're just a pain today as the screws are usually badly damaged. This example is a bit recent and has a screw down case back. I wonder is the stamped 61S denotes year of manufacture? Groton watches are not too rare but stainless steel cases are less common and you usually find basemetal cases watches. I've got it on a vintage brand which is super supple and suits the watch. It is similar to a 'bonklip' in function. This is the bandmakers mark. Cheers! Anilv