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Your car is very nice. However, it is not a Town Sedan. It is a Holiday Sedan.

Olds made only two body styles for the '67 Delta 88 Custom, both hardtops. The two-door was called Holiday Coupe, and the four-door was called Holiday Sedan. These names for these body styles were used by Olds all through that era. A Town Sedan would have a center pillar between the front and rear windows on each side. The 98, Delta 88, and Delmont 88 all were offered in Town Sedan versions. See the image below, which is from the '67 Olds brochure.

I have a '67 Delta 88 convertible, so I do have some familiarity with these cars. Good luck on the sale of yours.