Identifying some trades on the P7M13

[Greykin]

I just got my MGC P7M13 awhile ago, and it's pretty sweet.
I notice this trade on it, has a bird with a big "N" on the bottom. The manual explains what it means, but it's all in Japanese, so I have no clue what it is about, can anyone help me out? Oh, and also the trade on the far right, beside the "IE", looks like a weird squiggly, I don't know what that means either. I'm just a curious fellow.

[Gryphon]

The Eagle is called the Bundesadler, a commonly used German insignia. The N indicates the gun has been proof tested for nitrocellulose. A bit redundant on modern firearms and is likely more tradition than anything else. The IE is the date code for when the gun was manufactured, in this case 84 (1984).

[Greykin]

Oh, thanks! You don't know what that weird squiggly thing is though? =(

[Dustball]

I've seen that wierd squigly thing on other HK guns too, perhaps it's just some other HK symbol.

[Gryphon]

From HKPRO:

The symbol to the right of the date code is a stag horn. It is the symbol of a particular proof house, located in Ulm, Germany. German firearms are sent to proof houses before sale, for inspection and quality control. This is much like a 'UL' listing for American small appliances. There are other proof houses, for example, in Kiel and Hannover, Germany, but HK uses the Ulm proof house exclusively.

[Greykin]

OOOOh, thanks! That really helped feed my curiousity =).