Netherlands, post 1970 proofs

Hello everyone,

I've taken this Gulden piece (https://en.numista.com/catalogue/pieces738.html) as an example: here, on Numista, Dutch proof coins end in 1970. However, the image of this 1975 coin clearly shows it's a proof and Krause/NGC list proofs for all the mint years.
I'd like to hear the opinion of our Duch colleagues on this.
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Anyone?

I’m not Dutch but here is my opinion. I’m not sure but from what I’ve searched the Juliana coins after 1970 look like that in annual sets or in high grade. I’ve linked a couple below as a example.

The seller has listed it as a “proof set”.
https://www.ebay.co.uk/itm/174566566053?hash=item28a4fa68a5:g:azoAAOSwPqleEhEl

https://www.ebay.co.uk/itm/124964029923?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20180213162448%26meid%3D977991d8749b4f369cf68663d58fb453%26pid%3D100930%26rk%3D1%26rkt%3D12%26sd%3D174566566053%26itm%3D124964029923%26pmt%3D0%26noa%3D1%26pg%3D2332490%26algv%3DDefaultOrganicWeb&_trksid=p2332490.c100930.m5375

https://www.ebay.co.uk/itm/184588617792?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20180213162448%26meid%3D977991d8749b4f369cf68663d58fb453%26pid%3D100930%26rk%3D8%26rkt%3D12%26sd%3D174566566053%26itm%3D184588617792%26pmt%3D0%26noa%3D1%26pg%3D2332490%26algv%3DDefaultOrganicWeb&_trksid=p2332490.c100930.m5375

According to my Netherlands catalog, proofsets were made in low numbers until 1972. Exact mintages are not given but with low numbers they really mean LOW (60 ex are mentioned).
Then they reduced the mintages even more drastically for 1973 onwards (how can you reduce drastically if the original mintages were only 60???).
In 1980 they resumed with more normal figures in the tens of thousands...