Rosco57, I'm posting both the long form of the Sync report that shows all the gory detail and the short list that I normally post. Here's why. The 858-629 sync (see below) resulted from a pair of 858s that fell on a single day in 2001, not exciting. But the 290-312 sync (see below) looks like the real deal. There is an old instance from 2010, but there have been two recent instances in close proximity in 2019 and 2023. I like that one. Here goes:
Sync Workup (# Days ago, # instances, leader number, target number)
31,2,029,303
31,2,367,723
30,2,241,298
29,2,446,923
28,2,200,184
28,2,691,106
28,2,691,770
27,2,808,305
27,2,808,307
27,2,808,355
27,2,808,836
27,2,871,447
26,2,020,045
26,2,020,323
25,2,374,198
24,2,141,982
24,2,263,197
24,2,263,796
23,2,070,161
23,2,922,576
22,2,041,469
22,2,041,517
21,2,424,434
20,2,392,036
20,2,392,425
20,2,956,726
19,2,015,257
19,2,887,441
19,2,887,825
18,2,712,893
17,2,013,801
17,2,782,119
17,2,782,893
16,2,504,612
15,2,581,769
14,2,157,630
14,2,243,665
14,2,243,928
13,2,712,005
13,2,853,171
12,2,212,899
12,2,321,160
12,2,321,672
11,2,576,159
11,2,576,457
11,2,576,716
11,2,576,893
10,2,158,362
10,2,158,794
09,2,527,274
09,2,527,383
09,2,527,444
09,2,858,161
09,3,858,692
09,2,858,855
08,3,290,312
08,2,290,959
08,2,408,572
07,2,749,198
07,2,805,322
07,2,805,451
05,2,060,161
05,2,060,641
04,2,428,340
04,2,604,993
03,2,055,385
03,2,055,546
03,2,055,580
03,2,658,404
02,2,908,526
01,2,888,441
And here is the short form I usually post:
Sync - 005 036 045 106 119 159 160 161 161 161 171 184 197 198 198 257 274 298 303 305 307 312 322 323 340 355 362 383 385 404 425 434 441 441 444 447 451 457 469 517 526 546 572 576 580 612 630 641 665 672 692 716 723 726 769 770 794 796 801 825 836 855 893 893 893 899 923 928 959 982 993