Due to a recent question about Spiegel 99's and having a lot of spare time.... I dug out some rear blocks I had that fit the hole pattern on the Spiegels, I also found a very hard to read list of applications & spec's for Lyman scope blocks that another member posted a while ago. I read one of the front blocks as ET but based on a post in another thread listing a BT I looked closer and that is correct, that puts it in the correct alphabetical order in the full list. I made a short list of the blocks listed for the 99's, front & rear all list 'Special Taper' -
(*** this is a newer copy, the original had a block 'LL' listed, looking closer it was for a Savage 19, not a 99)
The rear blocks listed are 'R', 'V', 'W' & 'Y'. Looking at some blocks I have, 3 tall - 2 unmarked and one a 'Y', 2 shorter blocks - 1 a 'V' and a slightly short one an 'R', it's listed as being taller than the 'V', but it is the shortest of three. They also list a 'W' which I do not have, it lists a height between the 'Y' & 'V'.
There are only two front blocks listed for the 99's, BT and T, one grooved & one flat top. Both list 'special taper' and they are the only front blocks in the complete list to have that. All the years I've been looking for scope blocks I have yet to find a tapered front mount. With all these blocks listed by Lyman I think they had to be selling to more than just Spiegel, I seen no reason to have so many, or to even list any, if they were for just one end user, but they might have thought by offered them they might 'take off' to become a big money maker.....
None of the blocks are contoured lengthwise and all are over contoured in the width
so they contact the receiver only at 4 small points & leave gaps.
Examples of pointed and cupped attaching screws -
The full Lyman list -
I have a picture comparing the hole pattern for these mounts to those for a King-Pike mount here -
24hourcampfire.com//14773377added - did this as an afterthought -