I see no Winchester Model 550-1 in the Standard Catalog of Firearms or Modern Guns. Check you source for the correct model number.
5501.0
Yes
5500
The Bold and the Beautiful - 1987 1-5501 was released on: USA: 13 February 2009
5500
5501/500
5501/500 in lowest terms
11.002 = 11002/1000 and 5501/500. It simplifies to: 111/500
The ISBN of Line War is 1-4050-5501-4.
5500
1-800-430-5501 Customer Service
33.1386