hi Andy,
i drove last april from india to switzerland on an enfield. i got my iranian visa in switzerland, before leaving. i stayed longer than i thought in India and my visa was not valid anymore. i went to sri lanka for a month and got my new iranian visa there. the iranian ambassy still had to send my visa application to teheran to have a new one. so i guess there is no use to have one visa outdated. i assume you will just loose your money.
good luck
cheers
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