... participating here.
No need to apologize! Thank you anyway. I just suggested you to open a new thread with photos and data of your Sub, and introduce yourself, in a separate thread, so our most knowledgeable members will notice it and give you some information about it.
As per the serial number of your 6536 Sub, it was made circa 1957. It is a classic model, and I hope it is in good original condition. May be you can tell us something about its story, how long it is with you, or of you are its first owner.
I enjoyed reading about your interests, and I thank you for sharing that with us!
Best cordial regards, Abel.