I'd like to welcome you as well Dimasalung! and as a 'kamp follower'
I'll join in congratulating you on a great acquisition. There is a great deal of knowledge around here on these weapons, as you note, and Spunjer certainly is one of the pillars of that core.
A word of caution.....watch out for 'sellers who dont know what they have' !!
This is one of many old ploys used often in the sale of collectibles and antiques. Most individuals, even dealers involved in selling these items will ask many questions before selling them, and we constantly encounter posts from folks trying to find out what they have and how much its worth.
Its great to have you here joining us, knowledge is the best weapon you can own, and here we all learn together.
All the best,
Jim