There were 1894's that were made in the 60's and 70's with brass colored receivers. However what you may be looking at there is an image taken with the white balance way off. Dave
I went to pic #2 and saved. Opened and cropped out the receiver area. Just above the trigger was a worn area showing the thing had been plated along with wear to the right of the loading gate. The forearm tip had been plated too. Thanks, Larry