Here's what the Blue Book of Gun Values has to say:
MODEL 1910-FN (MODEL 1955) - 7.65mm (.32 ACP) or Browning 9mm short (.380 ACP) caliber, 4 in. barrel. FN manufacture. 701,266 mfg. 1912-1983.
100% 98% 95% 90% 80% 70% 60%
$350 $325 $300 $275 $250 $195 $150
add 20% if BAC (browning arms company) marked and 7.65mm, or if FN marked and .380 ACP cal.
add $100 minimum for special contract markings
This model is also referred to as the Model 1910/55. BAC marked pistols were imported 1954-1968. Importation ceased after the 1968 GCA.