I only have some information for you. Any JC Higgins air pistol that begins with model 126 was made by Crosman air gun. Any model that starts with 799 was made by Daisy air gun. I suggest you click the Crosman link below and check the owners manuals to try to locate your pistol. Then re-post the Crosman model number along with the condition of the pistol to get an estimate of value.
The model 454 was made between 1972 - 82. you did not state the condition of the pistol so it is not possible to answer you as to the value,
If the pistol is a model 1903 hammerless it was made in 1907 I cannot tell you the value.
The Mark II BB/177 pellgun was made between 1981 - 1986
Call Colt with the sn and they will tell you.
Crosman says It was produced between 1954 and 1956
The model Benjamin 137 was made between 1946-1985. But you will need the Serial No to tell the exact date. In 1957 Benjamin used the serial number to establish the date. From 1946 to 1957 there are no records as to the date. See the link below for more information. BTW today Crosman air gun company owns the Benjamin line of products.
Unfortunately Crosman doesn't have a listing by Serial numbers. But the pistol was made in two variations. The first variant was between 1964-1976. The first variant has metal sights and a metal cylinder. During this time they made a second variant that had a plastic rear sight and plastic cylinder for the pellets it was made between 1973 to 1976.
No. 100-200 USD or so.
Without knowing who made it, there is no way to tell. Even if you provide the country of origin, the records may not exist.
No sn data. No
It was made between 1956-1967