I have “a few” HiPowers. Some observations about that one:
1990 falls right around the time they switched from a forged frame to cast. Without digging up some material, I would say it’s from a little before the switch and is forged.
That has good points and bad. The forged is actually softer steel than in the cast frame. The cast frame came about when they made the BHP in .40 S&W, and it needed to be harder.
On the plus side, most people don’t know any of this and prefer to have a forged one.
All but the very, very early cast frames have identifying serrations in the bottom, around the magwell opening, that run fore and aft.
Are you sure that’s a no-bite C&S hammer? Not all of the C&S ring-types were. In fact, I would guess most were not, since C&S was selling that style for quite a while before making the no-bite type.
The no-bite is identifiable by having a scallop cut out of it below the spur in what I call the shank of the hammer.
The reason I bring this up is because the C&S “pre-no-bite” ring hammer might be the worst hand biter out there. Some people get bit by the hammer spur on BHPs, and some get bit by the shank. If you happen to to be one who gets bit by the shank and it’s not scalloped, you will find out soon enough.
Browning used a few different types of adjustable rear sights. Millet was one of the suppliers for a short time. I don’t think they ever sold any with a red insert in the front sight, but I suppose anything is possible. Millet sights are OK, if really tall, but don’t hit them with anything or the sight casting will break. I just happen to know this.
As a fan, I encourage everyone to buy one. To fully appreciate the grip shape, one has to get some thinner grips. The ones on it are pretty to look at, but they are also pretty thick. Thinner grips change the feel completely.
If you really study the frame design, you realize Browning or Saive (or both) really topped themselves as geniuses in how they designed it. Most of the grip area is the same width as a magazine. It’s pretty neat. Honor them by installing grips that make the most of that.