Phillips brand c1950? Please help me identify this awesome old frame!
There are numerous Vintage Bike Resource sites available. Old Roads.com, The Headbadge, are a couple I use. The Headbadge has a nearly complete list of Raleigh Catalogs for most years. It appears you have a frame at least similar to a Canadian Model 99 Gents circa 1954. It can be difficult to date a Raleigh bike visually as many models were made for decades with very few visual changes. The bolt-on chain stays aren't that unusual. I haven't found any definitive reason why they were used. Some feel it was just a hold over from the days of fully enclosed chain cases. It may also may have been to allow the chain to be removed without breaking the chain. For many owners a Raleigh was a once in a lifetime purchase. Hence the oiler port on the bottom bracket and wheel hubs.