Dear members, thank you all for your comments and information.
My father had took it once during the storing time to some sort of "preventive maintenance", I recall he told, and winded it occosionally as he was instructed. Now it had been some years just standing. I am not willing to put it on e-bay to look for the highest price but rather would be ready to release it for a collector who would continue storing it with respect. May sound silly but so it is. I will think about it.
Thank you again.
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