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Savage made all the Gambles Store rifles I have seen.
Most of the Gambles Store .22 rifles were made by Savage. Depending on condition, $75-$150.
The Gambles 103 is a Savage 30.
All of Gambles shotguns were made by Savage arms Company with the exception being the model GU-12-5517A which was made by J.C.Higgins.
check with: edssportshop.com
50-100 USD
The serial number
It is almost impossible to determine what a model number is based only on the serial number.
Depending on condition, between $50-125. These were known as Hardware Guns- a number of gun makers would make guns marked with the name of your company, for you to sell to your customers. Examples include Sears, Montgomery Ward, Shapleigh Harware, Gambles, and Western Auto stores. I believe your Gambles Store Pioneer was actually made by Savage Arms.
By the letter in the number
Yamaha outboards presently uses the last letter in the model number to determine the year model of the engine. Each letter of the alphabet represents a particular model year run.
By the serial number.