Okay, so I figured there's probably a few of us on here to collect the Takara Asia exclusive coins and premiums but it's hard to find a comprehensive list of them.
So why not make one here? If there's interest, I'll add to it over time. If not, well, that's that. Any omissions, please feel free to comment.
Masterpiece coins
Masterpiece "Commemorative Coins Holder" (for MP-9, MP-10, MP-11, DOTM Jetwing OP, Encore Devastator coins)
MP-01L Convoy (Optimus Prime) (Last Shot)
MP-8X King Grimlock (TRU Singapore)
MP-9 Rodimus Convoy (Rodimus Prime)
MP-10 Optimus Prime
MP-10B Black Convoy (Nemesis Prime)
MP-11 Starscream
MP-11S Sunstorm
MP-11SW Skywarp
MP-11T Thundercracker
MP-12 Sideswipe (v1)
MP-12 Sideswipe (v2)
MP-12+ Sideswipe (anime)
MP12G Sideswipe G2
MP-13 Soundwave (silver coin)
MP-13 Soundwave (gold coin)
MP-13B Soundblaster
MP-14 Red Alert
MP-14+ Red Alert (Anime colour)
MP-14C Clampdown
MP-15 Rumble & Ravage
MP-15/16E Cassettbot VS Cassettron
MP-16 Frenzy & Buzzsaw
MP-17 Prowl
MP-18 Streak (Bluestreak)
MP-18B Bluestreak (blue version of Bluestreak)
MP-18S Silverstreak (cartoon coloured Bluestreak)
MP-19 Smokescreen
MP-20 Wheeljack
MP-21 Bumble (Bumblebee)
MP-21G Bumble G2 (Bumblebee G2/"Goldbug")
MP-21R Bumble red body (Bumblebee toy variant colours)
MP-22 Ultra Magnus
MP-23 Exhaust (coin cancelled/not distributed)
MP-24 Star Saber
MP-25 Tracks
MP-26 Road Rage
MP-27 Ironhide
MP-28 Hot Rodimus (Hot Rod)
MP-29 Laserwave (Shockwave)
MP-30 Ratchet
MP-31 Delta Magnus (Diaclone Magnus)
MP-32 Optimus Primal (2018 reissue only)
MP-34S - Shadow Panther
MP-36 Megatron
MP-37 Artfire
MP-39 Sunstreaker
MP-40 Hot Rodimus (with Targetmaster) (Hot Rod)
Note: some coins have been re-released, so MP-10 and MP-12 have coins with different copyright years on the back
Masterpiece premiums/gifts (Asia exclusives unless noted)
MP-1B Black Convoy nameplate/bag/stand
MP-5G Megatron (gold) die cast Reflector
MP-8 Grimlock (reissue) flamesword (silicon cover)/die cast crown (in coin-like packaging)
MP-8 Grimlock (Cybertron Con exclusive apron)
MP-8X King Grimlock throne
MP-09 Rodimus Convoy display case
MP-10 Optimus Prime stand
MP-10 Optimus Prime key to Vector Sigma
MP-12 Sideswipe piledrivers (2x chrome) (Amazon.co.jp)
MP-13 Soundwave energon cubes (2x clear) (Amazon.co.jp)
MP-17 Prowl shoulder missile x1 (Amazon.co.jp)
MP-18 Streak shoulder missile x1 (Amazon.co.jp)
MP-21 Bumble battle mask (Amazon.co.jp)
MP-20 Wheeljack - Hypno-Chip Disruptor (Amazon.co.jp)
MP-27 Ironhide - die cast drill (late 2016 reissue only)
MP-29 Laserwave (Shockwave) Megatron gun (late 2016 reissue only)
MP-32 Optimus Primal die cast Mace
MP-33 Inferno - die cast Optimus Prime figure
MP-34 Cheetor - die cast Optimus Primal figure
MP-35 Grapple - die cast Ultra Magnus figure
MP-38 Supreme Commander Convoy (Optimus Primal re-deco) - bunch of bananas (TBC)
Hasbro MP-02 Soundwave - bonus die cast Soundwave in alt mode (December 2016 Taiwan reissue)
Cybertron Satellite Campaign
Mito Matrix (gold/purple)
Fukutso Matrix (black/clear)
Masterpiece comics (eHobby exclusive)
MP-1B Convoy (black version)
MP-3G Starscream (ghost version)
Unite Warriors coins
UW-01 Superion
UW-02 Menasor
UW-03 Defensor
UW-04 Devastator
UW-05 Grand Prime
UW-06 Grand Galvatron
UW-07 Bruticus
UW-08 Computron
UW-EX Lynxmaster
UW-EX Megatronia
UW-EX Baldigus (TBC)
Miscellaneous coins
Encore 20 Devastator
Encore 23 Fortress Maximus
Sixshot (reissue)
Jetwing Optimus Prime (DOTM "Optimus Prime - Supreme Class")
Cybertron Con Singapore 2012 coin (released at con with Universal Studios Singapore exclusive DOTM Optimus Prime)
Miscellaneous premiums/gifts (Asia)
Legendary Temenos Sword (repaint of AD-31 Optimus Prime sword)
APS-01U All Spark (die cast w/metal card/serial number)
APS-03 mini boombox (die cast)
Specialist Autobot Set - Autobot logo earphone cap plug (for smart phone)
Specialist Decepticon Set - Decepticon logo earphone cap plug (for smart phone)
TG-23 Metroplex head cord/cable holder
Encore 23 Metroplex head die cast earphone cap plug (for smart phone)
Titans Return Fortress Maximus - sword (limited promotional item - Asia)