There are approx 10 examples of CANCELLED hammers / impressions
of British stamps, of various designs.
Mainly for bulk mails, or, the impression includes the Department from whence the hammer was employed.
No examples of impressions from your epoch.
Hence my opinion would be that of Bobby De la Rue's response.
The value of the stamp, would also support that, together with a lack of a department inscription.Any other CANCELLED impressions on Brit Stamps? Please contribute
Machine Cancelled Bulk Mailings
Source : The Philatelic Web