Here is an interesting one. According to seller (non-watch person questioned after sale), it came as seen from an estate drawer. Could very well be on the original leather band. There was so much corrosion "greening" on the pins and hinges, it was obvious it was unmolested for a very long time. Face is a brushed silver and face and hands show no signs of radium. May have been refinished long ago, but I highly doubt it.
Case has a pinhead sized dot of plating wear on the four upper case corners - it is a remarkably well preserved example and keeping time "straight from the sock drawer". Original dust cover and ring intact.
Curiously, there is no date stamp on the 4 adjustment 15J movement, but case bears a 1926 s/n with the common lightly stamped and slightly off center first "6".
Case exterior has no stampings, besides "GF" on either end between the lugs. Case is double hinged.
I believe this is the "Green Gold" variant of the 1926 Spartan, as offered (white or green) in 1926 ads. Last photo shows it freshly polished next to a confirmed 1936 white gold Bulova Ambassador, the color difference is pretty obvious.