Theme: By The Numbers - 40's, 50's, 60's.
20. 19th-century military service revolver : COLT FORTY-FIVE
37. Steak sauce brand : HEINZ FIFTY-SEVEN
53. Highway originally from Chicago to Santa Monica : ROUTE SIXTY-SIX
Argyle here. If there is more to this than ending in double-digit numbers, I don't see it. Not as complex as Warren's Ground Hog Day puzzle last Feb.
Across:
1. "__, poor Yorick!": Hamlet : ALAS. Hamlet: Act 5, Scene 1.
5. Fig. on a new car window : MSRP. (Manufacturer's Suggested Retail Price)
9. B equivalent, in music : C FLAT
14. Phnom __, Cambodia : PENH. Capital city
15. Prefix meaning "god" : THEO
16. Vivien of "Gone With the Wind" : LEIGH. Katie Scarlett O'Hara Hamilton Kennedy Butler.
17. Jason's ship : ARGO
18. Walt's friend, and enemy, in "Breaking Bad" : HANK. No idea.
19. "L.A. Law" lawyer : ARNIE. No idea.
23. Visine dose : EYE DROP
24. In the thick of : AMIDST
27. Brit. reference : OED. The Oxford English Dictionary originally published in 1884 and there is an interesting story behind it, too.
28. Barbie's guy : KEN
30. Piddling amount : DRIB. Often partnered with DRAB. LINK
31. Famous : KNOWN
34. "__ bet?": "Care to wager?" : WANNA
36. Altar promise : I DO
40. Piercing tool : AWL
41. See 13-Down : YANKS. And 13D. With 41-Across, Bronx ball club, familiarly : THE
42. Slammin' Sammy of the links : SNEAD
43. Catches in the act : NABS
45. Robert E. Lee's org. : CSA. (Confederate States of America)
46. Asian New Year : TET
47. Position in the batter's box : STANCE
49. Luxury apartment feature : TERRACE
56. Under way, to Sherlock : AFOOT
58. Weight loss plan : DIET
59. Karma : FATE
60. Eponymous swindler Charles : PONZI. Quite a schemer.
61. Former student : ALUM
62. Fed. power dept. : ENER.
63. Plagued : BESET
64. Sulk : MOPE
65. From Chicago to Boston : EAST. For those with no wish to head West.
Down:
1. Quickly : APACE
2. "Bad, Bad" Brown of song : LEROY. There is a nice bio about Jim Croce with the clip if you go to YouTube.
3. One of four in a square : ANGLE
4. Debunked : SHOT DOWN
5. Highest peak in Ore. : MT. HOOD
6. Like a honed knife : SHARP
7. Landlord's charge : RENT
8. Slammer : POKY. Jail.
9. Insurance case : CLAIM
10. Marked by intense feeling : FERVID
11. Solid baseball hit : LINE DRIVE. (frozen rope)
12. IRS Form 1040 calculation : AGI. (adjusted gross income)
21. Agitated state : FRENZY
22. Keister : FANNY
25. Album's first half : SIDE A
26. Govt. obligation : T-BOND
28. "The Trial" novelist Franz : KAFKA
29. Tolkien tree giants : ENTs
31. Ruling descendants of Genghis : KHANs
32. Unfamiliar with : NEW AT
33. Some Oklahoma billionaires : OIL BARONS
34. Comes out on top : WINS
35. State as fact : ASSERT
38. Diamond surface : FACET
39. Competitor's payment : ENTRY FEE
44. Clock radio "Shut up!" button : SNOOZE
46. iPhone user's "Keep in touch" : TEXT ME
48. Be effective : CUT IT. Can you cut it?
49. Traffic jam : TIE UP
50. Yoga posture : ASANA. I'm starting to learn it - the word, not the positions.
51. Quotes as a source : CITES
52. Apply, as pressure : EXERT
54. Netherlands cheese : EDAM
55. Farm storage cylinder : SILO. Nit free today, I hope.
56. LAPD alert : APB. (all-points bulletin)
57. Friend's opposite : FOE
Argyle