Case measures 37mm lug to lug x 32mm non inclusive of the Crown using Calipers.
Butler finish Dial shows applied Gilt Hour markers, Bulova signature with 'Selfwinding' insignia below are printed in Black.
Hour and Minute Hands are Gilt Index style and a Gilt Index Seconds Hand shows on a Cross-Hair sub Dial above the 6.
17 Jewel Swiss Automatic Movement is encompassed by a shock absorbing ring.
The Glass is retained by a press fit bezel, Caseback is stamped as shown.
Vintage dispaly ad is Dated 1957.