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Are there any other exertizing entities, e.g. Sismondo, where an additional cert might prove useful?
I have Sismondo Certificates but that will not do for my purpose.
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What time period is the cover?
1953 as noted in the title. The US stamps are all Prexies. [Prexie + Jeff should reveal from whence it came wtcrowe

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It is really hard to provide a recommendation when you are playing "hide the ball." If the reason has to do with identification of the US stamp, the answer will be different than if the reason is identification of the Tibet stamp. If the question is whether one of the stamps originated on the cover, the answer might be different again.
No playing "hide the ball" here. There is no, zero, none, problems about the Prexies used on the cover. Nor as I mentioned any reason overall to doubt the cover, rather for my next step I need a certificate from a competent expertizing authority group. A single expertiser certificate will likely not do., even if from SCF member Mr Crowe.
EDIT: While it may take some time to pass I do follow through with eventual postings such as here:
http://goscf.com/t/77557 within days of the sale of the material.