All Garrett: Ace 250 (two), AceApex, VX-9. Have owned just about every Garrett ever made. First three detecter I made myself, with the first one in 1962.
Yep, these kinds of watches use cheap battery-operated quartz movements with generic retro and pseudo-Victorian bronze/brass cases originating from China. They’ve been made for a number of years, but note that battery-powered quartz movements for wrist or pocket watches weren’t commercially available until the very end of 1969 and didn’t become inexpensive mass-produced items until the 1980s.
They’re often sold as pendant watches for ladies, or as unisex fashion, and there are multiple variations in design, with some having ornate snap-covers to protect the crystal with various themes for particular markets… birds, butterflies, flowers, zodiac symbols, cars or whatever.
Multiple companies still sell them today, such as HUIBBGO, Univers Gosset, Holy Sins, and Royal Opera among others with prices ranging from about $8 to $40.