I have a problem answering your question. First of all you have not given any information about the condition of the rifle. The current condition has a lot to do with the estimated value.
Second problem is, Benjamin never made a (model1) rifle for mass production or sale. Oh they made a first model it was the St Louis 1899 model not a model 1. They also made a second model called the 1900 model, then the 1901 and model "A" in 1902.
I suggest you locate a "Blue book of airguns 10 edition" and look for your self. You may be able to identify your model more closely.
The exact value of a Remington 22 automatic long rifle model 550-1 would actually be dependent upon a number of factors. Some of these factors would be the age and condition of the rifle.
1-1000
$350-$500, depending on the exact version, and the condition. The rifle is a Number 1, not Mark 1. Only Ruger pistols are Marks.
Your rifle is worth about $3600.
If your rifle is a original M-1 Garand rifle,not a recent Springfield Amory model;then your serial number indicates that your rifle was made in the year 1941.
1$
250.00
your rifle was made in 1940
serial number on 550-1 remington 22 rifle
I'll give you a £1
Don't know value, and without serial number listed, dates of manufacture run from 1884 for # 1 to 1902 starting @ # 89300.
Kinda depends on what exactly it is. Several different types of rifle saw service in WWI.