The model 122 was part of the Benjamin 110 series of rifles they included the 110, 112 and 117. They were made between 1938 to 41. Today Crosman owns Benjamin. Crosman offers a search service of people who repair older airguns.
Click on the Crosman link below and then "click' on "Find a service center" Follow the prompts to find someone who repairs your model.
Benjamin made this model from 1946 to 1985, but did not start serializing them until 1957. I also have a Benjamin Franklin that has no serial number. Before 1957 it is not possible to set an exact date. Just know it's OLD. The 137 is a .177 caliber pellet pistol the 132 is a .22 caliber pistol and the 130 is a BB pistol.
GUNPARTSCORP.com and JACKFIRSTGUN.com carry lots of parts.
I have a Model 101-22 Cal. L.R. SN 10467 that I will sell for parts.
Crosman co owns Benjamin and Sheridan. They supply parts for current and some older model Benjamin air rifles or they offer a service to locate someone who repairs older Benjamin rifles. See the link below. When it opens click on "Find a service center."
Benjamin is owned by Crosman corp. They have, on their web page, a service to locate and repair Benjamin, Crosman and Sheridan air guns. Some parts are available from Crosman directly. If it is and older part go to the Crosman link below and then click on "Find a service center" it will help you locate someone who may help you find your parts.
Gun shop, gun show, want ad, e-gunparts.com
Which model. If the model number starts with 126 it was made by Crosman if it starts with 799 it was made by Daisy.
I suggest that you go to the Crosman homepage ( they own Benjamin) and click on "Download a manual" there you will find the owners manual and parts diagram for your rifle. See related link.
Brownells gunsmith and Down East guns are two places to find parts for the pistol. You can also find parts at auction shops and local gun stores.
Even though that gun was made by Wiinchester and is basically the same as the Model 1200, the trigger guard and stock are different and those parts from the Model 1200 will NOT interchange. There is no commercially available pistol grip kit for the Sears Model 200.
It depends on the model but Crosman (Who Owns Benjamin) offers a free service to locate shops that repair older air guns. See the link below.
Crosman no longer repairs or has parts for this pistol, but they do offer a service that will help you locate someone who does repair older pistols and rifles. See the link below. ( Find a service center.)