No way to tell from your description. What is the bbl length? Finish? Wood? Any engraving? Do you have original paperwork (owner's manual, etc.) or box? Check the auction sites to see if you can find one in similar configuration/shape. . Go to http://www.browning.com/customerservice/dategun/index.asp to date it.
The number X1850 indicates the serial number.This serial number shows that you have a browning auto-5 16 gauge shotgun that was made in the year 1947.
Range 100-400 USD
Check your serial number,you have to many digits.
With the serial number that you have provided,your Browning auto-5 shotgun in 16 gauge was made in Belgium for Browning in the year 1926.
If you have a 12 gauge model auto-5 Browning shotgun?Then it was produced by FN of Belguim for Browning in 1923.If you have the same shotgun in 16 gauge,then it was produced in 1928.
0-525 usd
If your browning auto-5 shotgun is a 12 gauge then it was made in 1927,if you have a 16 gauge shotgun it was made in 1934.
You will need to call Browning.
Use the link below
If you have a Browning auto-5 shotgun in 12 gauge it was made in the year 1925.If it is a 16 gauge shotgun,then it was made in the year 1929.
Between 275-500 dollars depending on the barrel type your shotgun has and the overall condition of the shotgun in question.
Your serial number indicates that your Browning auto-5 16 gauge shotgun was made in the year 1947.