Dear
Call it nostalgia, if you wish, but as I was glancing over some of the accounts we have had for several years, I stopped when I arrived at the name of (name of firm)
It has been a long time since our very first transaction was initiated and it is with a great sense of pride that I realize how far both of our firms have come since that day so many years ago. The fact that our relationship has not only lasted, but has flourished over this period of time, is most rewarding.
Thank you for the past, for the present, and may the future be a continuance of that which was established on (date)
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