The subject is the certificate, so the quality and condiation are both to certified as described in your text.

I would fill out the shorthand as follows:

Certificate(s) [will be] issued by a first class international surveyor, at Seller option and expense, [which will thus state the] Final [quality and condition] at [the point] of load[ing].

THE FOLLOWING FROM THE US GOVT REFERS TO A SIMILAR SITUATION:

Inspection Certificate

Weight and Quality certificates should be provided in accordance with governing USDA/GIPSA regulations for loading at port and loading at source/mill site as appropriate.

Costs of all inspection, certificates/ documents at the load port are usually the responsibility of the seller.

http://www.export.gov/logistics/eg_main_018121.asp

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