I think your mower is a mid 70s Deluxe B 14. There should be a brass plate under a bolt just near the starter. It should have stamped on it B14 - or B something depending on its width. I am in the middle of semi restoring mine. They are very UNpopular over here in WA. They crop up on Gumtree and most people have no idea what they are and the local workshops dont want to know about them . My dad has had one for over 40 years. They are temperamental - will absolutely not tolerant stale fuel at all and some people reckon they are too fast . I like em!!! I grew up using an Atco and dont like using the SB/Rover 45 , but I like their looks and ubiquity. Spray painted it Brunswick green and got the decal off Ebay. Its going to be my regular mower so its not gunna be showroom spec.