By October 1964, Grumman's lunar module design had grown to 33,000 pounds, up from the original 22,000-pound, two-stage design.
Notes on verification
Exact figures (33,000 lbs, October 1964) match the original Smithsonian source verbatim; independent sources confirm the overall trend of major weight growth from a 22,000-lb original design, but give slightly different intermediate numbers and dates, so the precise figure/date pairing isn't independently corroborated.