Yeah you've kind of got a quality/construction/plastic vs. weight issue going on. So the ones I've got that would come CLOSE to meeting your criteria are:
Swarovski CL B 8X30- 473gm
Nikon Monarch HG 8X30- 451gm
Nikon Monarch 7 8X30- 437gm
Those are actual weights of binocular only. Any of those are nice binoculars. No doubt the two at the top are the better quality instruments. The CL B is probably the absolute brightest. The Nikons have the most FOV. I certainly wouldn't let a few gms get too much in the way of me getting a nice binocular. Those three would be really good ones to give strong consideration. I don't have a picture of those three together but I'd be happy to take one in the morning if that would help.
Swarovski CL B 8X30- 473gm
Nikon Monarch HG 8X30- 451gm
Nikon Monarch 7 8X30- 437gm
Those are actual weights of binocular only. Any of those are nice binoculars. No doubt the two at the top are the better quality instruments. The CL B is probably the absolute brightest. The Nikons have the most FOV. I certainly wouldn't let a few gms get too much in the way of me getting a nice binocular. Those three would be really good ones to give strong consideration. I don't have a picture of those three together but I'd be happy to take one in the morning if that would help.