We also have the curious case of this razor.
Note concerning this razor it is possible they may have switched the razors back to British made Aristocrat Jr styled razor sometime after 52.
We do know for sure it couldn't have been in a Canadian Rocket set prior to 52 since they never offered a Gold plated Deluxe razor until then. It also couldn't be 52 since we know with a 100% certainty those sets had the Super Speed styled Rocket so later 53 or later is the only possible candidate.
No conclusive evidence either way.
What we do know is the ad space always shows the Super Speed styled razors packaged in the blue cases but the ads from 54 - 56 use the same pictures as those originating in the 52 and 53 ads. If they used newer pictures we could say for sure it is whatever razor they used but they didn't. We also don't have any documented Super Speed styled razors with date codes past 52. X2 is the last one I've seen. If they made them past then we should see higher number dated coded razors like Y and Z date codes for example. Thus far no examples have surfaced. We also know they sold British Aristocrat sets during this time period and it possible this razor may have been sold as a yet as as known numbered set in Canada during 52 - 56 along side Rocket sets.