Sg Number For This One Pound Rhodesian Specimen Stamp Wanted

If you can help me it would be greatly appreciated.

I make it something like Stanley Gibbons #90a Blackish purple 1902 P14
However, I read that the "specimen" was punctured
CV £900 (1993)
Caveat: Newbie for Rhodesia , perhaps reading catalogue incorrectly.
I believe yours is Type 12.

Thank you Rod. I have seen some perforated sets but only one overprinted thus far. Trying to pin it down. Your info is a great start.

In SG Information and Guidelines : Specimens.
I confirm perf=punctured
I do not see any seriffed "specimen" types, in the designs offered on the page.
If mixed punctured and overprinted, their code was "Optd/perf"

From the scan I think that it is the SG90 greyish red-purple rather than the 90a blackish purple, checking the perforations should help differentiate. Type 12 is the drawing number which also applies to the £1, £2,£5 etc.

Specimens were issued perforated as per SG as well as a black italic diagonal overprint like yours. If I recall correctly the black italic overprint were from presentation packs and scarcer than the perforated specimens.
The SG £900 catalogue price is for the perforated specimen set of 10 values
Clive

Many thanks for that information Clive and Rod.

Right you are, thanks Clive, for explanation.
My catalogue appears to be a mid range catalogue between Specialised, and Simplified. Perhaps that's why the presentation packs not listed.

You can see the Specimen overprints and punctures here:

http://www.rhodesia.co.za/BSA_COMPANY_18.html

Nice one Jill.
Image lifted, confirms the presentation packs.

"Greyish red-purple" that was a surprise. Clive was correct.