Perhaps it went like this. When stock Rollei cameras were taken to the tropics, there must have been problems resulting from certain materials being exposed to prolonged heat. So, on a special order basis, the factory modified some cameras for use in the tropics, using different materials. If I had to guess, it could be different glue used to keep the covering on, and maybe different grease used to focus the lenses. --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list