Hi Brad, welcome to the forum. You have the most common configuration that Parker made, a 30" VH 12 gauge. I believe there were in excess of 30K made as such, yours was made in 1925. The markings you inquired about are as follows:
12- gauge of the gun
1 1/2- frame size (Parker made different size frames)
V in circle-signifies the barrel steel, Vulcan in this case
#4-unstruck barrel weight in lbs. Most times there is a second digit for ounces.
JG in oval- James Geary, inspector
VH-V is the grade, H signifies hammerless.
Also there are surviving records for your gun. Consider joining the PGCA and ordering one. Never know what it might tell you. We gotta have pics to determine value. Condition, condition, condition. Good luck !
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