Unfortunately, this is not easy to answer. Liberty is not a brand name, but a model name. A model name that was used by several companies spanning over 60 yrs, and several nations. The majority of these were very inexpensive firearms, generally grouped under the term "suicide special". Values may range from $25-$50 for the newer guns made in Germany, to $100 or so for older US made guns.
what model, caliber. ????????
What model .38?
1912
1911
1910
2006
1871
Caliber should be on the barrel. SN's were not required until 1968
Early 1930s
50 or so; no published sn data.
Swiss 1920-1940
Impossible to answer without knowing the model and caliber.