Hi Bart,
Looks like a great Vz.24! Congratulations on the find. My guess, and its's only a guess, is the this rifle was brought back from Japan or the Philippines. The Japanese Navy bought 40,000 (maybe 50,000?) from Ceskoslovanska Zbrojovka Brno in 1938. The deal however was concluded under the Third Reich since Germany occupied Bohemia and Moravia in 1939. Both China and Japan bought Vz.24's from CZ in the P- and C- series, with receiver crest-dates of "1937", with China acquiring a number well over 150,000. There are many documented rifles in the P-series which have been imported from China and Europe since 1989. However, the proponderence of rifles in NRA VG-Excellent condition are those sent back by GI's from Japan itself. The known serial number range for the P-series VZ.24 extends from low numbers with three digits to rifles in the 99,000 range.
I believe that the rifles dated "1937" were especially designated for export.
Regards,
John