Well, there were several Model F Star pistols which can be initially divided into pre-WW2 and post-WW2. The prewar pistols have a safety behind the trigger, where the post war guns have a thumb safety. There were also several variations of the Model F, with an additional letter such as FK, with set trigger, orthopedic grips, accurized, and so forth.
The Model F most often seen is the post-war version with a 4" barrel that does not extend past the slide, 10-rd magazine and fixed sights. You should be able to find the Spanish date code possibly under a grip panel (letter and number such as 'G2').
There are other types of Model F have extended barrels with barrel weights and are called Model F Target and Model F Olympic.
Assuming yours is a standard postwar Model F in excellent condition, you would be looking at around $200-$250.
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