Thank you for the additional images/ information and your patience.
My sincere apologies for the delay
The presented object appears to be a German-produced P.38 semi-automatic pistol with an authentic holster. This 9 mm pistol was made by the Spreewerke (marked "cyq") and has the inspection 88 hallmarks of the Waffenamt.
This piece is in good condition and there are no serious damages visible. Because of the long storage, it is possible that pieces in the inside could be corroded.
An estimation would be between 500 to 1.000 USD.
This estimation is based on actual recent past recorded auction sales of comparables. Retail "asking prices" can be higher and vary.
With kind regards,