What do you mean with "the original ones" no longer made after 1997? It depends on what model you talk about and what is personal hallmark for you.

If, for instance, you talk about +4 DHCs, the last one was made in 1968, although sold in 1969.

Other variations on a similar theme are possible. I would be interested to learn which 1961 DHC you are working on.

Hermen