From the Treasury Department Historical Association:

Eleven Christmas Tree Tax Ornaments, including my favorite: the 1993 ornament issued on the 80th Anniversary of 16th Amendment:

THA's fifth annual ornament depicts the first Form 1040 as a commemorative of the 80th Anniversary of the authorization to collect tax on income. The ornament measures approximately 3-1/4 by 3-1/2 inches….On January 5, 1914, the Department of the Treasury unveiled the new Form 1040 for tax year 1913. 

IRS Notecards:

THA's Internal Revenue Service Building notecards depict six works of art displayed in the IRS National Office Building, each showing various architectural features of the New Deal-era IRS headquarters. The top-fold cards measure about 4-1/2 by 6 inches and arde packaged 12 to a box, 2 of each of the 6 prints, with envelopes.

Other items include:

• Treasury Postcards
• Treasury Building Lithographs