Saving Old Seagulls

The closest I thought I'd ever come to owning a Marston was when a beautifully restored SD came up for sale on Ebay. I imported this from UK to NZ. Like most highs in life the law of diminishing returns applies. Coincidentally the opportunity to own a Marston came up recently in the form of an OP - ...

My SD with number SD123 presumably would have been next door but one to SD125?

That's cool. I'm trying to find where the JM number on the stator plate would be located. I removed the coolie hat cover, but couldn't see it. Do I need to remove the fly wheel? For some reason my old man seems think a puller would be OK on the SD? I've never seen any Seagull literature saying a fly...

There is no such thing as a "Navy model" Any better photos of the stamp? See the close-up which has been well polished in the past, but you can make out the crown. The serial number is SD123.P3 which I understand would be one of the earlier ones. Who do I contact to get this engine put in...

Can anyone help identify the stamp on the skeg of my SD102? Looks like a crown with line underneath and number but been polished. -Refer attached photo.

I believe it's a 'Navy' model??

As per the title I'm after some parts for my SD with brass fittings:
Brass trumpet air intake
Copper fuel line
Steel tank
2 blade swept prop

Based in Auckland NZ so you'd need to be willing to package up and work in with me as far as air freighting to NZ.

Thanks in advance!

Andrew