I was able to eventually build a decent collection of Seikos I wanted for their function as well as design simplicity...never worried about collectibility or future value...the 6105 I picked up for $75 when Wayne Lee was the owner/moderator of the S/C forum..a fair deal by the seller and a nice savings for me...NOTHING has been done to this watch and the only issue is not having the locking pin for the crown...
The Marine Master was a reward to myself after i had been given a cash award for a carving I had done for Habitat for Humanity in an annual auction they have to raise money through an event...I am the second owner and it cost me $1050..a sum I would never have even considered if not for the "free" money.
Both of these keep time within 5 sec/day which is meaningless to most people and when you are retired it is something to laugh about...if you know what I mean.
While I have another 20 or so watches in my overall collection, quite enough for my current and future needs, I wear these about 70% of the time and have had quite a few comments and inquiries on the 6105..
If you have either or both of these I would be sure to keep them since they are truly classics...