@Outlawmws -
Indestro didn't offer any metric tools until their 1959 catalog No. 22

1959 Indestro catalog No 22 pp 85
The 1961 catalog No. 22A offers pretty much the same paltry selection.
Not until the 1971 catalog No. 55 did Indestro offer a broader assortment of metric tools, and it was limited to 1/4", 3/8", and 1/2" drive shallow sockets, metric open-end wrenches from 6 mm - 26 mm, and metric combination wrenches from 7 mm to 22 mm.
In the 1971 catalog they added a 47036 1/2" drive 36mm 12-point socket. It fit the flywheel nut on a Volkswagen.
Several years went by before we saw the 46007HD - 46019HD (hex deep) 6-point deep-wells in metric sizes, and they were all on backorder forever. I believe I have 12, 13, 15, and 17mm deep-wells from that era. (The other sizes I acquired after I joined here in 2015.)
Part of what made the 3/8" drive stuff more "rare" was Indestro's failure to market the boards properly. IF they had sent men out into the field to up-sell their accounts and get the boards updated, there might be more metric Indestro in the second-hand market.
When they published the 1982 catalog No. 60, they offered 1/4", 3/8", and 1/2" drive metric sockets. The catalog shows 1/4" drive metric deep-wells, but I have never seen any in real life.

1982 catalog No. 60 pp 24
They added some metric hex bits to the line-up. (Again, a product I've never seen in real life - only in the catalog.)
They added 3/8" and 1/2" drive metric impact sockets, but as with the above, I've never seen any in real life.
They also added 3/8" square drive metric universal joint sockets, and again, as above, I have never seen any in real life.
There were a lot of items published in the catalog that were never shipped. When the fill rate on orders dropped below 35%, my brother-in-law dropped the line and switched it over to Thorsen.