Lovely vintage Speidel No. 58 GP band, this is either the Ben-Hur or the Calhoun.
Case back outside has "Bulova10K gold filled" at one end and the serial no. at the other end.
Very nice, clean dial and hands, very light wear to case back, case front hardly any wear to gold fill.
Case dimensions are 36mm X 26mm, lugs 13mm gape, both sides. Crystal roughly 27.5 X 17.5mm.
Photos by seller, Davethedrums, as I cannot get pics from my new camera to upload.