Show these to illustrate a real $500. Gruen 1941+ and a $50. postGruen 1960+. The cheap one is actually nice neat thin rugged practical and looks good from a distance. The other is a complicated design 14k solid case with the 440a curved movement first in 1941. The black dials do not degrade in 50+ years like the common silver, look a little more masculine. To indicate why it is hard to price vintage stuff , the old one is offered on ebay $500. to $2500. The cheap one could be any price under $150. The old one without gold case could also be anywhere under $300.
The 3 best photos are by seller. A fine example of a good ebay seller. Ebay name Squinty is source
for reasonable price high quality watch straps. Notice how a good seller will show movement running and closeup of dial.