Glad I could help resolve the mystery 😊
Clue was the most unusual structure of the foredeck.
I'm pretty certain that this 'one off' never ever wore the number 1258!
I've not seen any other versions
with this foredeck structure.
Which of course doesn't necessarily mean they didn't exist!
I can only assume that the model builder used the Pennant number 1258 from sheer nostalgia for a boat he may have served on, but 1258 sure wasn't built like the model you have.
Whatever, have great fun sailing her, post some pics / videos when she's finished please 👍
All the best, Doug 😎