yezer,
The markings were polished off the pistol. In addition your gun had a phosphate finish on some of the parts which were removed and blued over. Notice the slide release still retains that finish. Most likely, the e/Waa135, e/s, e/Waa135 on the right slide have been buffed out as well.
The following photo shows what the acceptance stamps and proof mark on the right slide should look like.
Mark
Download Attachment:
AcceptanceStamps.jpg
55.5 KB
And what a Dual tone SVW45 with the phosphate finish should look like
Download Attachment:
SVW45.jpg
176.91 KB
The markings were polished off the pistol. In addition your gun had a phosphate finish on some of the parts which were removed and blued over. Notice the slide release still retains that finish. Most likely, the e/Waa135, e/s, e/Waa135 on the right slide have been buffed out as well.
The following photo shows what the acceptance stamps and proof mark on the right slide should look like.
Mark
Download Attachment:

55.5 KB
And what a Dual tone SVW45 with the phosphate finish should look like
Download Attachment:

176.91 KB