Vintage Seamaster & Chronometer Help Please

Good morning - I recently found these two watches among my late father's watch collection and hope to learn more about them. I've done a bit of research and have found similar models but not exact matches. Both are in working condition and keep accurate time. The Seamaster band has the original Acier Inox buckle. The Chronometer bracelet is marked 14 KT G.F. I have not attempted to open the cases for fear of causing damage so do not have additional information. Should I have them professionally cleaned and serviced or leave them as found? Any guidance and information (age, value, etc.) would be greatly appreciated.

The first is a Seamaster with the same reference number as the Ranchero (2990/2996, cal. 267), but the dial was swapped for a Seamaster, either at the factory or by a dealer. The Ranchero name wasn't well received, so the dials were swapped. It's commonly called the "Seachero." As for the second, I don't know the reference number- I'm not very familiar with quartz watches.

Your father had good taste.
As for whether you should have them professionally cleaned, serviced, or left as is, well that depends.

I believe the consensus in a watch enthusiast forum will be that it's always good sense to have a watch serviced and taken care of.

If you plan on wearing them, then yes it's worth taking them to a reputable vintage watchmaker for a cleaning and service. You don't want any refurbishing or refinishing of the watch itself. Polish the crystal, clean the case, service the movement, maybe throw it on a strap or band that speaks to you, and you'll have a partner ready for whenever the occasion calls.

Ranchero/Seachero's in particular have some good value (in the region of $1k+), though the dial on yours is quite heavily patinated. I'll leave a proper estimate to someone more knowledgeable on it.

Tuning fork chronometers on the other hand, probably in the mid $500-1k range.

This is how the Ranchero and Seachero look side by side - both sharing the same reference 2990 and powered by the caliber 267 movement.