I need an ad hoc translator of handwritten historical documents

I am looking for an ad hoc translator of handwritten historical documents in various languages including French, German, Old German, Portuguese, Italian, Russian, etc.

We are an auction house dealing with historical documents and letters. We hold four auctions per year and, until items arrive, we do not know what we are expecting so are looking for individuals who can translate said documents in a short time frame so we can use these translations to produce catalogue descriptions. The documents will arrive by email and we would need to know within 48 hours whether these can be actioned.